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Erosion sediment yield and water quality assessment in a subwater shed of Taal Lake, Philippines / by Leyma L. Cero.

By:

Cero, Leyma L [author]

Contributor(s):

Luis, Victor S. Jr [adviser]

Material type: Text

TextLanguage: English Publication details: Los Baños, Laguna: Cavite State University- Main Campus, 2001.Description: xiv, 114 pages : illustrations ; 28 cmContent type:

text

Media type:

unmediated

Carrier type:

volume

Subject(s):

DDC classification:

631.3 C33 2001

Online resources:

Click here to view thesis abstract and table of contents

Abstract: CERO, LEYMA LEYNES. University of the Philippines Los Banios, March 2001. Erosion, Sediment Yield and Water Quality Assessment_in a Subwatershed of Taal Lake, Philippines. Major Professor: Dr. Victor S. Luis, Jr. The study was conducted to assess the erosion-sedimentation system and its water quality implications in a subwatershed of Taal Lake, Philippines. Sheet and rill erosion from the 200-ha Angasin watershed was estimated using a modified Universal Soil Loss Equation. The average and total soil losses were 45.72 tons/ha/yr and 9,144.61 tons/yr, respectively. Among the three types of land cover and for all slope ranges, soil loss per unit area was found highest from areas under diversified cropping followed by shrublands and the least was from coconut areas. Based on suspended load measurements conducted from July 1999 to July 2000, the suspended sediment yield of the Angasin River was estimated at 37.88 tons/ha/yr. The relation between sediment concentration in mg/L (C;) and discharge in L/s (Q) was found highly significant (C; = 0.0056Q*"' , R = 0.732). The derived relation between sediment discharge in kg/hr (qs) and Q was expressed as q, = 0.00002Q3!!®? with R? = 0.855. Water quality sampling conducted during the same period revealed that temperature, total suspended solids, total dissolved solids, electrical conductivity, and iron concentration were statistically higher during the wet season. pH was found significantly higher during the dry season. In general, water quality deteriorated towards the downstream portion of the river. Sedimentation is known to affect the quality of receiving waters. C, was found to significantly affect turbidity and iron concentration (both quadratic), phosphate concentration (geometric), and nitrate concentration (linear).

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Holdings ( 1 )
Title notes ( 4 )

Holdings
Item type	Current library	Collection	Call number	Materials specified	URL	Status	Notes	Date due	Barcode
Theses / Manuscripts	Ladislao N. Diwa Memorial Library Theses Section	Non-fiction	631.3 C33 2001 (Browse shelf(Opens below))		Link to resource	Room use only	T-2248		00002780

Thesis (Ph.D. - - Agricultural Engineering) University of the Philippines, College, Laguna.

Includes bibliographical references.

CERO, LEYMA LEYNES. University of the Philippines Los Banios, March 2001. Erosion, Sediment Yield and Water Quality Assessment_in a Subwatershed of Taal Lake, Philippines. Major Professor: Dr. Victor S. Luis, Jr.

The study was conducted to assess the erosion-sedimentation system and its water quality implications in a subwatershed of Taal Lake, Philippines.

Sheet and rill erosion from the 200-ha Angasin watershed was estimated using a modified Universal Soil Loss Equation. The average and total soil losses were 45.72 tons/ha/yr and 9,144.61 tons/yr, respectively. Among the three types of land cover and for all slope ranges, soil loss per unit area was found highest from areas under diversified cropping followed by shrublands and the least was from coconut areas.

Based on suspended load measurements conducted from July 1999 to July 2000, the suspended sediment yield of the Angasin River was estimated at 37.88 tons/ha/yr. The relation between sediment concentration in mg/L (C;) and discharge in L/s (Q) was found highly significant (C; = 0.0056Q*"' , R = 0.732). The derived relation between sediment discharge in kg/hr (qs) and Q was expressed as q, = 0.00002Q3!!®? with R? = 0.855.

Water quality sampling conducted during the same period revealed that temperature, total suspended solids, total dissolved solids, electrical conductivity, and iron concentration were statistically higher during the wet season. pH was found significantly higher during the dry season. In general, water quality deteriorated towards the downstream portion of the river.

Sedimentation is known to affect the quality of receiving waters. C, was found to significantly affect turbidity and iron concentration (both quadratic), phosphate concentration (geometric), and nitrate concentration (linear).

Submitted to the University Library 07/20/2001 T-2248